Abstract: A gauge wheel assembly for a hand held portable power tool has first and second gauge wheels arranged on opposite lateral sides of a working attachment of the tool to contact the ground and gauge the height of the working attachment relative to the ground. The gauge wheel assembly includes a clamp assembly that clamps to an outer surface of a tubular boom of the tool. First and second arms extend outwardly from opposite lateral sides of the clamp assembly and have distal portions that support the gauge wheels adjacent to the lateral sides of the working attachment. A plurality of mounting locations are provided in the distal portions of the first and second arms for adjustably mounting the gauge wheels to the arms. The working attachment can be a rotary sweeper that extends in a cantilever fashion from a center gearbox attached to the tubular boom.